Back-to-health program (5)
I believe the answer is:
rehab
'back-to-health program' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rehab that I've seen before include "A herb (anag.)" , "Treatment for alcohol or drug dependence" , "Process of restoring, eg, an addict to health" , "Health-restoring process" , "help with addiction" .)